Human beings normally have a total of 46 chromosomes, with each
chromosome present twice, apart from the X and Y chromosomes in
males. Some three million people worldwide, however, have 47
chromosomes: they have a small supernumerary marker chromosome
(sSMC) in addition to the 46 normal ones. This sSMC can originate
from any one of the 24 human chromosomes and can have different
shapes. Approximately one third of sSMC carriers show clinical
symptoms, while the remaining two thirds manifest no phenotypic
effects. This guide represents the first book ever published on
this topic. It presents the latest research results on sSMC and
current knowledge about the genotype-phenotype correlation. The
focus is on genetic diagnostics as well as on prenatal and
fertility-related genetic counseling. A unique feature is that
research meets practice: numerous patient reports complement the
clinical aspects and depict the experiences of families living with
a family member with an sSMC.
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